Spring



(No Model.)

w. J. DAVIDSON.

PLOW. No. 307,919. Patented Nov. 11, 1884.

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' UNrTEn STATES PATENT FFIGEO \VILLIAM J. DAVIDSON, OF BIG SPRING,VIRGINIA.

PLOW.

.JPECIFICATION forming part of Letters Patent No. 307,919, datedNovember 11, 1884. I Application filed February 20, 1884. (No model.)

To (LZZ whom it may concern.-

Be it known that I, IVM. J. DAVIDSON, of Big Spring, in the county ofMontgomery and State of Virginia, have invented certain new and usefulImprovements in Plo ws, of which the following is aspecification.

My invention is a plow having a beam in two parts connected, to secure acontinuous rigid structure, with interposed elastic material'confinedunder compression, so that the danger of breaking is lessened and, theplowblades or cultivator-teeth will be caused to adapt themselves tohard and soft land.

In the accompanying drawings, Figure 1 shows a plan view of a doubleplow with my invention attached thereto. Fig. 2 shows a similar view ofmy invention applied directly to the plow or cultivator beam. Fig. 3 isa sectional view. Fig. 4 is a perspective view of the parts' detached,and Fig. 5 is a sideview of a modification.

Heretofore it has been common to make the teeth of drills and the likeadjustable and yielding; but this involves a considerable expense, andthe means of doing so are comparatively complicated and liable to getout of order, and the means adopted are not well adapted to plows andcultivators. I accomplish the result by a very simple arrangement thatcan be easily adapted to plows and cultivators now in general use atvery little expense, and when applied is not liable to get out of order.

Referring to Fig. 1, which shows one form of cultivator, the beam Aismade with a curved neck, a, the handles B being pivoted at x to the beamand adj ustably secured to the neck. On one or both sides of the beam Aare secured brackets D D, of any desirable shape or form, and to thebrackets are secured the standards 0 .0.

Between the beam A and the brackets D, I interpose a spring device, asblocks E, of some elastic or yielding material, preferably of rubber. Inorder to get the proper bearing upon the blocks, and to hold them inposition, I provide clamps or plates F F, having at each'end flanges ff, preferably bent in opposite directions, and through the centers ofthe clamps I provide elongated holes or slots 8. Bolts G G pass throughthe beam A, blocks E, clamps F, and through the brackets, and aresecured outside thereof by nuts. From this construc- 'block,' as shownin dotted lines Fig. 2.

1 tion it will be seen that the brackets are se cured to the beam in ayielding manner, one of the flanges f of one of the plates or clamps Fbearing upon one edge of the bracket, and the other flange bearing uponthe elastic or yielding block, and one flange of the other clamp bearingupon one edgeof the beam, and the other flange bearing upon the oppositeside of the yielding block, and when any pressure or strain is caused tobear upon the brackets the clamps will tend to compress the yieldingblocks between their opposite flanges and allow a movement of thebracket more or less depending upon the adjustment of the initialpressure upon the blocks caused by the screwbolts. Not only will thisarrangement allow of a movementin a vertical direction, but also in ahorizontal direction, and both of these movements may be adjusted orregulated by the initial pressure upon the yielding or elastic blockscausedby tightening or loosening the nuts upon the bolts.

In Fig. 2 I have shown a beam, A, made in two parts, which are securedtogether by means of my improved arrangement, so that they may yield inthe manner heretofore pointed out. In this arrangement the standards maybe secured to the beam directly or by brackets, as described inreference to Fig. 1. In a single plow I prefer to secure the beam adjustably; but in a double plow or cultivator I prefer to secure thebrackets adjustably to the beam.

Instead of forming the clamps of separate pieces, the flanges may becast upon or otherwise secured to the beam and brackets; and, instead ofhaving two sets of clamps, one may be used, the flanges being turned inthe prop er directions to bear upon the beam and the yielding material;and, instead of two bolts passing through the blocks and clamps, asinglebolt may be used to hold the bracket to the beam, passing through thebracket and beam between the blocks, or through a single In some caseswhere more movement is desired the holes either in the beam or bracket,or both, may be made oblong transversely thereto, as indicated in dottedlines.

The standards may be attached directly to the clamps independent of thebracket. I

Many modifications will suggest themselves IOO which may be made withoutdeparting from the spirit of my invention, which consists in attachingthe parts of a plow or cultivator to gether by the means described, soas to form a practically rigid structure, but one that will yieldslightly to pressure, so as to prevent breaking of the parts by anysudden shock or jar, and so that the plow or cultivator will be adaptedfor all kinds of land, whether hard or soft.

In some instances where the above-described arrangement does not givesufficient amount of yielding movement the standards may be attached tothe bracketor to the beam, so as to yield before they will break, and toaccomplish this I provide a longitudinal slot, m, as shown in my PatentNo. 254,932, in the beam or bracket, and an inclined notch, 41, throughwhich the bolts securing the standard are passed. If the strain upon theparts is too severe, the pressure of the standard against the edge ofthe inclined slot will cause the bolt in the slot m to move forwardslightly,'when the bolt in notch n will slip out of place, allowing thestandard to give way under the strain without breaking.

I do not herein claim, broadly, the use of springs or cushions toprevent the injurious effects of shocks or strains upon the plow orcultivator.

I claim- 1. A plow having a beam in two parts connected, to secure acontinuous rigid structure, with interposed elastic material confinedunder compression, substantially as and for the purpose set forth.

2. The beam A, in combination with the bracket D, the yielding orelastic block E, the clamps F F, having flanges f f, and means forsecuring the same together, as set forth.

3. The combination, with the beam or bracket provided with the elongatedslot m and inclined notch 12, of the standard secured thereto by bolts,the arrangement being such that upon too great strain upon the standardthe bolt will slip from the notch n, as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WM. J. DAVIDSON.

\Vitnesses:

F. L. FREEMAN, WVM. S. SAYERs.

